Configuring proxy for Adept
Settings global proxy in system settings is fine. But still one has to setup proxy in apt.conf file if adept has to know the proxy. So open up the terminal and type
sudo kate /etc/apt/apt.conf
comment the following line (if present)
Acquire { http { Proxy ‘false’; }; }; ==> #Acquire { http { Proxy ‘false’; }; };
Add the following line below it
Acquire::http::Proxy “http://username:password@proxy.domainname.com:port_num”;
Save the file. You are done. 
happy adepting
I would like to ackowledge this post
Hi,
Just like to add a couple of points to this which may be helpful:
1) Package managers – “Adept” and “apt”
Adept and apt are not the same product, though they share the use of sources.list (and cache, by the looks of things). They’re intended to use the same proxy settings, but don’t – the above will get apt working beautifully, but if like me you’re using kUbuntu, all GUI package-related activity is performed using Adept by default, and it DOESN’T use either the system-wide proxy settings, apt.conf settings or environment variables. To date, I haven’t found a way to make it work. However, it is a known in bug in Adept – see http://bugs.kde.org/show_bug.cgi?id=117185, written by the Adept author. Hopefully someone will post a result soon.
2) Proxy settings for MS-based proxies
Just a helpful hint; it took me AGES to finally find this!
If the proxy you have to use requires authentication, and is eithe MS ISA, or requires credentials in the format
DOMAIN\Username
then your entry in the apt.conf file shoudl look like
Acquire::http::Proxy “http://DOMAIN\\username:password@proxy.domainname.com:port_num”;
Note the double backslash syntax instead of the traditional single backslash you’d be used to when using a Windows domain account.
Hope this helps someone, peace, love and lentils…
Thanks Stevie
But I hope configuring apt.conf works with Adept too
Because I was also using Ubuntu and configured the proxy this way. I think it worked for 8.04
Let me get back after checking again.